How must the vent from a Gas Fired Appliance be installed if it vents into a chimney flue serving a solid fuel appliance?

The correct answer emphasizes the requirements of proper venting for gas-fired appliances when they are connected to a chimney flue that also serves a solid fuel appliance. Installing the vent through a separate flue opening above the connection point of the solid fuel appliance is crucial for ensuring safety and preventing backdrafts.

This installation method helps to avoid intermingling the exhaust gases from both the gas-fired appliance and the solid fuel appliance, which could result in hazards such as carbon monoxide buildup or smoke backflow. By using a separate flue opening, the venting systems are kept distinct, allowing for better performance of each appliance and minimizing the risk of blockages or backdrafting that could occur if the gasses were to share the same pathway.

This approach is also in line with most local codes and safety standards, which typically require that the venting for different types of appliances be separate to maintain safety and efficiency.